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The strong nuclear force is of interest in both nuclear and particle physics. The strong force is one of the four fundamental interactions. The others are gravity, electromagnetism and the weak force.
The strong nuclear force holds ordinary matter together. It confines quarks into hadron particles and by a residual effect, binds protons and neutrons together. For example, consider both the proton and neutron. A proton is two up quarks and a down quark while a neutron is two down quarks and an up quark.
The strong force also acts to bind these protons and neutrons into atomic nuclei.
Individual quarks make up about 1% of the mass of the proton. The rest of the mass is the result of the strong force field energy.
Quarks actually carry a property called color charge. The three kinds are red, green and blue. The strong interaction is mediated by gluons, which themselves carry color charge, able to interact with themselves. This makes quantum chromodynamics different from quantum electrodynamics, i. e., gluons can interact with other gluons but photons cannot interact with other photons.
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